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| EFFECTS OF RARE EARTH ADDITIONS ON THE COHESION OF OXIDE SCALE IN AN Fe-Cr-Al ALLOY |
| Zhang Fuzhong;Sun Chuanyue Baotou Institute of Metallurgy Research and Shanghai Electrical Alloy Plant |
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Cite this article:
Zhang Fuzhong;Sun Chuanyue Baotou Institute of Metallurgy Research and Shanghai Electrical Alloy Plant. EFFECTS OF RARE EARTH ADDITIONS ON THE COHESION OF OXIDE SCALE IN AN Fe-Cr-Al ALLOY. Acta Metall Sin, 1980, 16(4): 394-400.
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Abstract In Fe-25Cr-5Al electrical resistance alloy, the presence of 0.103% La, 0.092%Ce, 0.068% mischmetal or 0.25% Yappeared to increase its service life significantlyeither found by accelerated life testing or by isothermal life testing procedurerespectively. There is also a rise in strength of oxide scales formed on the wiresurface.It is found that the distribution of alloying elements in the oxide scale ischanged markedly by the addition of RE. The enrichment of Fe and Cr ions inthe inner layer of the α-Al_2O_3 scale is suppressed, and in Y-containing alloy, theenrichment of Y in the scale causes the formation of Y_3Al_2(AlO_4)_3 phase (YAG).Both may give rise to the improvement of cohesion within the oxide scale whichwould in turn contribute significantly to the increase in service life of the alloy.
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Received: 18 April 1980
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